Trump is being sued by people he blocked on Twitter

First Amendment advocates sued President Trump on Tuesday for allegedly blocking critics on Twitter, claiming the action is unconstitutional.

"Twitter enables ordinary citizens to speak directly to public officials and to listen to and debate others about public issues, in much the same way they could if they were gathered on a sidewalk or in a public park, or at a city council meeting or town hall," the lawsuit said.

The lawsuit, filed in the Southern District of New York by seven defendants and the Knight First Amendment Institute at Columbia University, said the Twitter users were blocked after criticizing Trump. White House Press Secretary Sean Spicer and White House Director of Social Media Dan Scavino were also named in the lawsuit.

Jameel Jaffers, the institute's director, said dozens of people have reached out to the institute about this issue.

"It's fair to say that this is a new frontier," Jaffer told NBC News. "The First Amendment principle is well-settled, but the applicability of that principle to this context isn't an issue that the courts have yet had many occasions to address."

The lawsuit asks Trump and his media team to stop blocking critics from following his personal account, which has more than 30 million followers.

The institute noted that Trump is not the only lawmaker blocking critics. Numerous politicians on both sides have blocked people after they post critical comments on the politicians official social media accounts, Jaffer said.